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        <h4 id="字符串简介"><a href="#字符串简介" class="headerlink" title="字符串简介"></a><strong>字符串简介</strong></h4><p>字符串是PHP中重要的数据类型之一，属于标准变量类型。一个字符串(string)就是由一些列字符组成，每个字符等同于一个字节，字符串需要书写到定界符中。</p>
<a id="more"></a>


<h4 id="定界符的使用"><a href="#定界符的使用" class="headerlink" title="定界符的使用"></a><strong>定界符的使用</strong></h4><p>常用定界符：</p>
<ul>
<li>单引号</li>
<li>双引号</li>
<li>heredoc结构</li>
<li>nowdoc结构</li>
</ul>
<h5 id="单引号和双引号"><a href="#单引号和双引号" class="headerlink" title="单引号和双引号"></a><strong>单引号和双引号</strong></h5><ul>
<li>单引号不解析变量和特殊符号，定界符中的字符会以纯字符输出。</li>
<li>双引号会解析变量和特殊符号，定界符中的字符会先解析再输出。<div class="highlight-box"autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" contenteditable="true"data-rel="PHP"><figure class="iseeu highlight /php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">echo</span> <span class="string">'string\n'</span>;  <span class="comment">//输出string\n</span></span><br><span class="line"><span class="keyword">echo</span> <span class="string">"string\n"</span>;  <span class="comment">//输出sting后换行</span></span><br></pre></td></tr></table></figure></div>

</li>
</ul>
<h5 id="heredoc结构和nowdoc结构"><a href="#heredoc结构和nowdoc结构" class="headerlink" title="heredoc结构和nowdoc结构"></a><strong>heredoc结构和nowdoc结构</strong></h5><ul>
<li><p>heredoc结构：通过heredoc结构定界符来写字符串，相当于双引号的作用。与直接用双引号不同的是，在heredoc结构中包含有双引号时，不需要使用转义符转义。</p>
<div class="highlight-box"autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" contenteditable="true"data-rel="PHP"><figure class="iseeu highlight /php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//开始标记名后不能出现空格或多余的字符。</span></span><br><span class="line">&lt;&lt;&lt;标识名  </span><br><span class="line">	内容……</span><br><span class="line">标识名;</span><br><span class="line"><span class="comment">//结束标记名前不能有任何内容，像制表符和空格都不可以</span></span><br></pre></td></tr></table></figure></div>
<p>示例：</p>
<div class="highlight-box"autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" contenteditable="true"data-rel="PHP"><figure class="iseeu highlight /php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">$str=<span class="string">&lt;&lt;&lt;EOH</span></span><br><span class="line"><span class="string">&lt;h1 style="color:blue"&gt;</span></span><br><span class="line"><span class="string">    "php",贼厉害。</span></span><br><span class="line"><span class="string">&lt;/h1&gt;</span></span><br><span class="line"><span class="string">EOH;</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">echo</span> $str;  <span class="comment">//输出蓝色字体，h1格式的："php",贼厉害。</span></span><br></pre></td></tr></table></figure></div>
</li>
<li><p>nowdoc结构：通过nowdoc结构定界符来写，相当于单引号的作用。但不同的是单引号无需转义，省去了多次转义单引号的工作量。</p>
<div class="highlight-box"autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" contenteditable="true"data-rel="PHP"><figure class="iseeu highlight /php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//开始标记名后不能出现空格或多余的字符,标识名需要用单引号扩起来</span></span><br><span class="line">&lt;&lt;&lt;<span class="string">'标识名'</span>  </span><br><span class="line">	内容……</span><br><span class="line">标识名;</span><br><span class="line"><span class="comment">//结束标记名前不能有任何内容，像制表符和空格都不可以</span></span><br></pre></td></tr></table></figure></div>

</li>
</ul>
<div class="highlight-box"autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" contenteditable="true"data-rel="PHP"><figure class="iseeu highlight /php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">$str=<span class="string">&lt;&lt;&lt;'EON'</span></span><br><span class="line"><span class="string">hello nowdoc结构&lt;br/&gt;</span></span><br><span class="line"><span class="string"><span class="subst">&#123;$user&#125;</span></span></span><br><span class="line"><span class="string">EON;</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">echo</span> $str;  <span class="comment">//输出：hello nowdoc结构 &#123;$user&#125;</span></span><br></pre></td></tr></table></figure></div>

<p>heredoc结构和nowdoc结构，作用类似于双/单引号，但当内容中出现多处引号时，无需像直接用引号定界符一样，每个引号前都加转义符，提高了工作效率。</p>
<h4 id="特殊字符的转义"><a href="#特殊字符的转义" class="headerlink" title="特殊字符的转义"></a><strong>特殊字符的转义</strong></h4><p>在定界符中的字符串内容如果包含引号，与定界符冲突需要使用\转义，才不会被错误解析。</p>
<div class="highlight-box"autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" contenteditable="true"data-rel="PHP"><figure class="iseeu highlight /php"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">echo</span> <span class="string">'this is \'string\''</span>;</span><br></pre></td></tr></table></figure></div>

<p>常用转义符：</p>
<ul>
<li>\n  换行</li>
<li>\r  回车</li>
<li>\t  水平制表符(Tab)</li>
<li>$  美元标记</li>
<li>&#39;  单引号</li>
<li>&quot;  双引号</li>
</ul>
<h4 id="将字符串中的变量扩成一个整体"><a href="#将字符串中的变量扩成一个整体" class="headerlink" title="将字符串中的变量扩成一个整体"></a><strong>将字符串中的变量扩成一个整体</strong></h4><p>在输出一个包含变量的字符串，变量后面如果还有字母等字符串，就会影响到变量的解析，这时，我们就需要用{}在字符串中将变量名单独扩起来。</p>
<div class="highlight-box"autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" contenteditable="true"data-rel="PHP"><figure class="iseeu highlight /php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">$str=<span class="string">'Sinan'</span>;</span><br><span class="line"><span class="keyword">echo</span> <span class="string">"MyNameIs&#123;$str&#125;Y"</span>;  <span class="comment">//输出MyNameIsSinanY</span></span><br></pre></td></tr></table></figure></div>

<p>通过{}可以对字符串中的字符做增删改查操作，通过字符数组的形式，字符串下标从0开始。</p>
<div class="highlight-box"autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" contenteditable="true"data-rel="PHP"><figure class="iseeu highlight /php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">$str=<span class="string">'abcfef'</span>;</span><br><span class="line"><span class="keyword">echo</span> $str;  <span class="comment">//输出未修改之前的字符串：abcfef</span></span><br><span class="line"><span class="keyword">echo</span> <span class="string">'&lt;br&gt;'</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">echo</span> $str&#123;<span class="number">3</span>&#125;;  <span class="comment">//输出下标为3的字符：f</span></span><br><span class="line"><span class="keyword">echo</span> <span class="string">'&lt;br&gt;'</span>;</span><br><span class="line"></span><br><span class="line">$str&#123;<span class="number">3</span>&#125;=<span class="string">'d'</span>;  <span class="comment">//修改下标为3的字符为：d</span></span><br><span class="line"><span class="keyword">echo</span> $str;  <span class="comment">//输出修改后的字符串：abcdef</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//删除：将需要删除的字符下标赋值null或者空即表示删除。</span></span><br><span class="line">$str&#123;<span class="number">5</span>&#125;=<span class="keyword">null</span>;  <span class="comment">//或者$str&#123;5&#125;=''，删除下标为5的字符f</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//增加：给指定下标赋值即可</span></span><br><span class="line">$str&#123;<span class="number">6</span>&#125;=<span class="string">'g'</span>;  <span class="comment">//在下标为5的位置，增加一个g</span></span><br></pre></td></tr></table></figure></div>

<p>输出字符串中的一个中文：如果使用utf-8编码，1个文字占用3位下标，所以想用下标的形式输出1个文字，需要输出3位下标。</p>
<div class="highlight-box"autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" contenteditable="true"data-rel="PHP"><figure class="iseeu highlight /php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">$str=<span class="string">'你好'</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">//依次输出下标0~2，成功输出一个中文字符：你</span></span><br><span class="line"><span class="keyword">echo</span> $str&#123;<span class="number">0</span>&#125;;</span><br><span class="line"><span class="keyword">echo</span> $str&#123;<span class="number">1</span>&#125;;</span><br><span class="line"><span class="keyword">echo</span> $str&#123;<span class="number">2</span>&#125;;</span><br></pre></td></tr></table></figure></div>


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<p>源自：本篇文章为慕课网PHP入门教程的知识总结<br>声明：以上内容如有不足之处，欢迎联系指正，转载请注明出处！</p>

      
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